The composer Philip Glass turns 75 today, so we thought we'd share some of our recent interviews with him. He was last on the show in November to talk about his opera, "Satyagraha," which was playing at the Metropolitan Opera.

Mr. Glass was also on the show in December 2008 to discuss "The Glass Box," a box set retrospective of his work.

He's on Soundcheck today to talk about his Symphony No. 9. Check out WQXR's blog The Operavore's "Choose Your Own Operatic Philip Glass Adventure."